Object creation in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new object of class Car.

Java

Car myCar = new [1]();

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ACar

Bcar

CVehicle

Dnew

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase class name like 'car' instead of 'Car'.

Forgetting to use 'new' keyword.

To create an object, use the class name with new. Here, Car is the class name.

2fill in blank

medium

Complete the code to create a new object of class Book with a constructor that takes a title.

Java

Book myBook = new Book([1]);

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A123

BJava Basics

Ctitle

D"Java Basics"

Attempts:

3 left

💡 Hint

Common Mistakes

Not putting quotes around the string.

Passing a number instead of a string.

String values must be in double quotes. So, "Java Basics" is correct.

3fill in blank

hard

Fix the error in creating an object of class Person with no-argument constructor.

Java

Person p = [1] Person();

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Amake

Bnew

Ccreate

DPerson

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the 'new' keyword.

Using other words like 'create' or 'make' which are not Java keywords.

The new keyword is required to create a new object in Java.

4fill in blank

hard

Fill both blanks to create an object of class Student and call its method study.

Java

Student [1] = new [2]();
[1].study();

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As

BStudent

Cstudent

Dstudy

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase for class name.

Using class name as variable name.

Variable name can be 's' and class name must be 'Student' with capital S.

5fill in blank

hard

Fill all three blanks to create an object of class Laptop with brand and price, then print the brand.

Java

Laptop [1] = new [2]([3], 1200);
System.out.println([1].brand);

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AmyLaptop

BLaptop

C"Dell"

Dbrand

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase for class name.

Not putting quotes around the brand string.

Variable name is 'myLaptop', class name is 'Laptop', and brand is a string "Dell".